178 Kansas Academy of Science. 



Superfamily Arcacea; Family VII ArcidvE. 

 Subfamily Pectunculin.e; Genus Pectunculus Lam. 

 Pectunculus patulus?. 

 A much- worn specimen, apparently of this species, was obtained 

 from the middle series of the Clallam formation as represented at 

 East Clallam. 



Superfamily Pectinacea; Family IX Pectinid^; Genus Pecten s. s. 

 4J a. Pecten (Chlamys) fucanus Dall?. 

 4J b. Pecten (Chlamys) wattsi var. morani Arnold?. 

 4 J c. Pecten (Pantinopecten) propatulus Con.?. 



Only fragments of Pectens, doubtfully classed as above, were 

 obtained at East Clallam, in the middle series there; no Pectens 

 were found at any other horizon. 



Order Anomalodesmacea; Superfamily Anatinacea. 

 Family XIV Thraciidae; Genus Thracia (Leach) Blainville. 



4^ d. Thracia trapezoides Conrad. 



Thracia trapezoides Con., Wilkes's Expl. Exped., p. 723, pi. 17, fig. 6. 



Conrad's description:^^ "Trapezoidal; ventricose; flank flat- 

 tened, carinate; side anteriorly compressed; surface faintly con- 

 centric undulate and neatly but unequally marked with con- 

 centric striee; beaks prominent, medial; posterior margin truncated: 

 basal margin tumid at middle; casts have surface faintly concentric 

 undulate; muscular impressions rather indistinct, the posterior 

 quite small; pallial sinus large." 



Only a fragment of a shell of this species was obtained in the 

 Oligocene-Miocene shales near Gettysburg, Wash. 



Miocene: Tomales, Cal. (Gabb). 



Post- Pliocene : Astoria (Conrad); Eagle Prairie (Gabb). 



Oligocene-Miocene: Gettysburg, Wash. (Arnold; Reagan), 



Superfamily Lucinacea ; Family XXI LuciNlDiE. 

 Genus (Phacoides) Lucina Brugiere. 



Shell rounded, orbicular, convex, white ; umbones depressed ; 

 lunule usually present and distinct ; margins crenulated or smooth ; 

 ligament oblique, semi-internal; dentition usually normal, two hinge 

 teeth in each valve, two lateral teeth in right valve, four in left ; 

 rugose muscular impressions; posterior extremity oblong ; anterior 

 elongated within the pallial line ; umbonal area with a deep fur- 

 row. Characteristic species, Lucina jamaicensis Linne. 



36. Loc. cit. 



